.page-about {
  --about-tl-col: 104px;
  --about-hair: 1px solid var(--line);
  color: var(--paper);
  font-family: var(--font-body);
  padding-bottom: clamp(56px, 8vw, 112px);
}

.page-about .breadcrumb {
  padding-top: clamp(24px, 4vw, 44px);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 0.8125rem;
  color: var(--fog);
}

.page-about .breadcrumb__item {
  color: var(--fog);
  text-decoration: none;
}

.page-about .breadcrumb__item[aria-current="page"] {
  color: var(--paper);
}

.page-about .breadcrumb__sep {
  color: var(--line);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-top: clamp(28px, 4vw, 56px);
}

.page-about .about-hero__inner {
  display: block;
}

.page-about .about-hero__eyebrow {
  margin: 0 0 18px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  color: var(--signal);
  text-transform: uppercase;
}

.page-about .about-hero__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(2.6rem, 8vw, 5.4rem);
  font-weight: 800;
  line-height: 0.98;
  letter-spacing: -0.02em;
  color: var(--paper);
  max-width: 14ch;
}

.page-about .about-hero__lead {
  margin: 22px 0 0;
  max-width: 54ch;
  font-size: clamp(1rem, 1.4vw, 1.1875rem);
  line-height: 1.85;
  color: var(--fog);
}

.page-about .about-figures {
  margin: 32px 0 0;
  display: grid;
  gap: 12px;
}

.page-about .about-figures > div {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  border-top: var(--about-hair);
  padding-top: 12px;
}

.page-about .about-figures dt {
  font-size: 0.8125rem;
  letter-spacing: 0.06em;
  color: var(--fog);
}

.page-about .about-figures dd {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-figures dd .mono {
  font-size: 1.375rem;
  color: var(--signal);
}

.page-about .about-hero__media {
  margin: clamp(28px, 4vw, 48px) 0 0;
  border: var(--about-hair);
  border-radius: 28px 28px 28px 72px;
  overflow: hidden;
  background:
    repeating-linear-gradient(0deg, rgba(30, 74, 99, 0.28) 0 1px, transparent 1px 40px),
    repeating-linear-gradient(90deg, rgba(30, 74, 99, 0.28) 0 1px, transparent 1px 40px),
    var(--harbor);
}

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 区块基础 ---------- */
.page-about .about-sec {
  padding-block: clamp(48px, 6vw, 88px);
  border-top: var(--about-hair);
  margin-top: clamp(32px, 4vw, 64px);
}

.page-about .section__eyebrow {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  color: var(--signal);
}

.page-about .section__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.7rem, 3.2vw, 2.75rem);
  font-weight: 750;
  line-height: 1.12;
  letter-spacing: -0.01em;
  color: var(--paper);
  max-width: 22ch;
}

.page-about .section__lead {
  margin: 16px 0 0;
  max-width: 52ch;
  font-size: 0.9375rem;
  line-height: 1.85;
  color: var(--fog);
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: clamp(32px, 4vw, 56px) 0 0;
  padding: 0;
}

.page-about .tl-item {
  display: grid;
  grid-template-columns: 1fr;
  row-gap: 10px;
}

.page-about .tl-year {
  display: flex;
  align-items: baseline;
  gap: 12px;
}

.page-about .tl-year__num {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--signal);
  letter-spacing: 0.02em;
  transition: color var(--dur) var(--ease);
}

.page-about .tl-year__tag {
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  color: var(--fog);
  border: var(--about-hair);
  border-radius: 999px;
  padding: 2px 10px;
  white-space: nowrap;
}

.page-about .tl-body {
  position: relative;
  padding: 0 0 40px 26px;
}

.page-about .tl-body::after {
  content: "";
  position: absolute;
  left: 0;
  top: 12px;
  bottom: 0;
  width: 1px;
  background: var(--line);
}

.page-about .tl-item:last-child .tl-body::after {
  background: linear-gradient(180deg, var(--line), rgba(30, 74, 99, 0));
}

.page-about .tl-body::before {
  content: "";
  position: absolute;
  left: -3px;
  top: 6px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--signal);
  box-shadow: 0 0 0 3px rgba(61, 224, 240, 0.16);
  transition: box-shadow var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .tl-item:hover .tl-body::before,
.page-about .tl-item:focus-within .tl-body::before {
  box-shadow: 0 0 0 7px rgba(61, 224, 240, 0.22);
}

.page-about .tl-title {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
  line-height: 1.3;
  color: var(--paper);
}

.page-about .tl-text {
  margin: 10px 0 0;
  max-width: 46ch;
  font-size: 0.9375rem;
  line-height: 1.85;
  color: var(--fog);
}

.page-about .tl-item:nth-child(3n + 2) .tl-text {
  max-width: 38ch;
}

.page-about .tl-item:nth-child(3n) .tl-text {
  max-width: 52ch;
}

.page-about .tl-why {
  margin: 14px 0 0;
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.875rem;
  line-height: 1.7;
  color: var(--fog);
}

.page-about .tl-why__label {
  flex: none;
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  color: var(--signal);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 2px 10px;
}

/* ---------- 六栏 ---------- */
.page-about .columns-grid {
  display: grid;
  gap: clamp(24px, 3vw, 40px);
  margin-top: clamp(28px, 4vw, 48px);
}

.page-about .columns-media {
  margin: 0;
  border: var(--about-hair);
  border-radius: 32px 32px 96px 32px;
  overflow: hidden;
  background: var(--harbor);
}

.page-about .columns-media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .columns-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .col-item {
  display: grid;
  grid-template-columns: 44px 1fr;
  column-gap: 16px;
  align-items: start;
  padding: 18px 0;
  border-top: var(--about-hair);
}

.page-about .col-item:last-child {
  border-bottom: var(--about-hair);
}

.page-about .col-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border: var(--about-hair);
  border-radius: 12px;
  background: rgba(18, 63, 91, 0.6);
  color: var(--mist);
  font-size: 0.875rem;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease),
    border-color var(--dur) var(--ease);
}

.page-about .col-item:hover .col-num {
  border-color: var(--signal);
  background: rgba(61, 224, 240, 0.1);
  color: var(--signal);
}

.page-about .col-body h3 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.0625rem;
  font-weight: 700;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .col-body p {
  margin: 6px 0 0;
  font-size: 0.875rem;
  line-height: 1.8;
  color: var(--fog);
}

/* ---------- 阅读视图 ---------- */
.page-about .reader-panel {
  position: relative;
  overflow: hidden;
  padding: clamp(26px, 4.5vw, 56px);
  border: var(--about-hair);
  border-radius: 40px 40px 40px 100px;
  background:
    radial-gradient(120% 140% at 100% 0%, rgba(18, 63, 91, 0.95), rgba(6, 24, 38, 0) 62%),
    var(--harbor);
}

.page-about .reader-panel::before {
  content: "";
  position: absolute;
  right: -80px;
  bottom: -120px;
  width: 320px;
  height: 320px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(61, 224, 240, 0.16), rgba(6, 24, 38, 0) 70%);
  pointer-events: none;
}

.page-about .reader-compare {
  position: relative;
  display: grid;
  gap: 16px;
  margin-top: clamp(24px, 3vw, 40px);
}

.page-about .reader-card {
  padding: 22px;
  border: var(--about-hair);
  border-radius: 22px;
  background: rgba(6, 24, 38, 0.55);
}

.page-about .reader-card--sim {
  border-color: rgba(255, 122, 51, 0.42);
  background: rgba(18, 63, 91, 0.5);
}

.page-about .reader-card h3 {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--paper);
}

.page-about .reader-card--sim h3 {
  color: var(--mist);
}

.page-about .reader-specs {
  margin: 0 0 14px;
  display: grid;
  gap: 8px;
}

.page-about .reader-specs > div {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  border-bottom: 1px dashed rgba(30, 74, 99, 0.9);
  padding-bottom: 8px;
}

.page-about .reader-specs dt {
  font-size: 0.8125rem;
  color: var(--fog);
}

.page-about .reader-specs dd {
  margin: 0;
  font-size: 0.875rem;
  color: var(--paper);
}

.page-about .reader-card p {
  margin: 0;
  font-size: 0.875rem;
  line-height: 1.8;
  color: var(--fog);
}

.page-about .reader-strip {
  position: relative;
  margin: 20px 0 0;
  padding-left: 16px;
  border-left: 2px solid var(--signal);
  font-size: 0.875rem;
  line-height: 1.8;
  color: var(--fog);
  max-width: 56ch;
}

/* ---------- 维护小组 ---------- */
.page-about .team-grid {
  display: grid;
  gap: clamp(24px, 3vw, 40px);
  margin-top: clamp(28px, 4vw, 48px);
}

.page-about .team-media {
  margin: 0;
  border: var(--about-hair);
  border-radius: 96px 24px 24px 24px;
  overflow: hidden;
  background: var(--harbor);
}

.page-about .team-media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .team-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .team-item {
  display: grid;
  grid-template-columns: 34px 1fr;
  column-gap: 14px;
  align-items: start;
  padding: 16px 0;
  border-top: var(--about-hair);
}

.page-about .team-idx {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: 10px;
  background: rgba(18, 63, 91, 0.75);
  border: var(--about-hair);
  color: var(--signal);
  font-size: 0.8125rem;
}

.page-about .team-item h3 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--paper);
}

.page-about .team-item p {
  margin: 6px 0 0;
  font-size: 0.875rem;
  line-height: 1.8;
  color: var(--fog);
}

.page-about .team-note {
  margin: 28px 0 0;
  max-width: 58ch;
  font-size: 0.875rem;
  line-height: 1.85;
  color: var(--fog);
  border-left: 2px solid var(--line);
  padding-left: 16px;
}

/* ---------- 四条做法 ---------- */
.page-about .practice-list {
  list-style: none;
  margin: clamp(28px, 4vw, 48px) 0 0;
  padding: 0;
}

.page-about .practice {
  display: grid;
  grid-template-columns: 52px 1fr;
  column-gap: 16px;
  align-items: start;
  padding: 20px 0;
  border-top: var(--about-hair);
}

.page-about .practice:last-child {
  border-bottom: var(--about-hair);
}

.page-about .practice__num {
  font-size: 1.375rem;
  font-weight: 700;
  color: var(--tide);
  line-height: 1.2;
  transition: color var(--dur) var(--ease);
}

.page-about .practice:hover .practice__num {
  color: var(--signal);
}

.page-about .practice h3 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.0625rem;
  font-weight: 700;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .practice p {
  margin: 6px 0 0;
  max-width: 54ch;
  font-size: 0.875rem;
  line-height: 1.8;
  color: var(--fog);
}

/* ---------- 节奏条 ---------- */
.page-about .rhythm-block {
  margin-top: clamp(32px, 4vw, 56px);
}

.page-about .rhythm-caption {
  margin: 0 0 18px;
  font-size: 0.8125rem;
  line-height: 1.75;
  color: var(--fog);
  max-width: 52ch;
}

.page-about .rhythm {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  align-items: flex-end;
  gap: 4px;
  border-bottom: var(--about-hair);
  padding-bottom: 8px;
}

.page-about .rhythm__item {
  flex: 1 1 0;
  min-width: 0;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  gap: 8px;
}

.page-about .rhythm__bar {
  display: block;
  height: 22px;
  border-radius: 4px 4px 0 0;
  background: var(--tide);
  transition: background var(--dur) var(--ease);
}

.page-about .rhythm__item:nth-child(1) .rhythm__bar { height: 14px; flex: 1 1 auto; }
.page-about .rhythm__item:nth-child(2) .rhythm__bar { height: 26px; }
.page-about .rhythm__item:nth-child(3) .rhythm__bar { height: 18px; }
.page-about .rhythm__item:nth-child(4) .rhythm__bar { height: 34px; }
.page-about .rhythm__item:nth-child(5) .rhythm__bar { height: 42px; }
.page-about .rhythm__item:nth-child(6) .rhythm__bar { height: 50px; }
.page-about .rhythm__item:nth-child(7) .rhythm__bar { height: 58px; background: var(--signal); }

.page-about .rhythm__item:nth-child(2) { flex-grow: 1.1; }
.page-about .rhythm__item:nth-child(3) { flex-grow: 1.35; }
.page-about .rhythm__item:nth-child(4) { flex-grow: 1; }
.page-about .rhythm__item:nth-child(5) { flex-grow: 1.5; }
.page-about .rhythm__item:nth-child(6) { flex-grow: 1.7; }
.page-about .rhythm__item:nth-child(7) { flex-grow: 1.9; }

.page-about .rhythm__item:hover .rhythm__bar {
  background: var(--mist);
}

.page-about .rhythm__year {
  font-size: 0.625rem;
  color: var(--fog);
  letter-spacing: 0.02em;
  text-align: center;
  white-space: nowrap;
}

/* ---------- 下一步 ---------- */
.page-about .about-next {
  margin-top: clamp(40px, 5vw, 72px);
  padding-top: clamp(28px, 4vw, 48px);
  border-top: var(--about-hair);
}

.page-about .about-next__lead {
  margin: 14px 0 0;
  max-width: 52ch;
  font-size: 0.9375rem;
  line-height: 1.85;
  color: var(--fog);
}

.page-about .next-links {
  margin-top: 26px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 桌面 ---------- */
@media (min-width: 900px) {
  .page-about .about-hero__inner {
    display: grid;
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    column-gap: clamp(32px, 5vw, 72px);
    align-items: end;
  }

  .page-about .about-hero__eyebrow,
  .page-about .about-hero__title,
  .page-about .about-hero__lead {
    grid-column: 1;
  }

  .page-about .about-figures {
    grid-column: 2;
    grid-row: 1 / span 3;
    align-self: end;
    margin-top: 0;
  }

  .page-about .about-hero__media {
    border-radius: 32px 32px 32px 120px;
  }

  .page-about .tl-item {
    grid-template-columns: var(--about-tl-col) minmax(0, 1fr);
    column-gap: clamp(28px, 4vw, 56px);
  }

  .page-about .tl-year {
    flex-direction: column;
    align-items: flex-end;
    gap: 6px;
    text-align: right;
    align-self: start;
    position: sticky;
    top: calc(var(--header-h) + 28px);
    padding-top: 2px;
  }

  .page-about .tl-year__num {
    font-size: 1.75rem;
  }

  .page-about .tl-body {
    padding-left: 32px;
    padding-bottom: 52px;
  }

  .page-about .columns-grid {
    grid-template-columns: minmax(0, 4fr) minmax(0, 7fr);
    column-gap: clamp(32px, 5vw, 72px);
    align-items: start;
  }

  .page-about .columns-media {
    position: sticky;
    top: calc(var(--header-h) + 28px);
  }

  .page-about .reader-compare {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.15fr);
    gap: 20px;
  }

  .page-about .reader-card {
    padding: 26px;
  }

  .page-about .team-grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
    column-gap: clamp(32px, 5vw, 72px);
    align-items: start;
  }

  .page-about .team-media {
    grid-column: 2;
    grid-row: 1;
  }

  .page-about .team-list {
    grid-column: 1;
    grid-row: 1;
  }

  .page-about .rhythm__year {
    font-size: 0.6875rem;
  }
}

@media (min-width: 1200px) {
  .page-about .about-hero__title {
    max-width: 13ch;
  }

  .page-about .reader-panel {
    padding: 56px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .tl-body::before,
  .page-about .col-num,
  .page-about .practice__num,
  .page-about .rhythm__bar {
    transition: opacity var(--dur) var(--ease);
  }
}
</mai>